Propylene-alpha olefin copolymers and methods for making the same

Abstract

Provided is a composition having 60 wt % to 95 wt % of a first propylene alpha-olefin copolymer component having a reactivity ratio product of less than 0.75 and a weight average molecular weight of greater than about 450,000 g/mol; and 5 wt % to 40 wt % of a second propylene alpha-olefin copolymer component having a reactivity ratio of greater than 1.5 and a weight average molecular weight of less than about 215,000 g/mol.

What is claimed is: 
     
       1. A composition comprising
 (a) from about 60 wt % to about 95 wt % of a first propylene alpha-olefin copolymer component having a reactivity ratio product of less than 0.75 and a weight average molecular weight of greater than about 450,000 g/mol; and 
 (b) from about 5 wt % to about 40 wt % of a second propylene-alpha olefin copolymer component having a reactivity ratio product of greater than 1.5 and a weight average molecular weight of less than about 215,000 g/mol; 
 
       wherein the composition has at least one of the following properties:
 (i) a tension set of less than about 12%; 
 (ii) a top load of less than about 7 N; or 
 (iii) a hysteresis of less than about 30%. 
 
     
     
       2. The composition of  claim 1 , having:
 (i) a tension set of less than about 12%; 
 (ii) a top load of less than about 7 N; and 
 (iii) a hysteresis of less than about 30%. 
 
     
     
       3. The composition of  claim 1 , wherein the alpha-olefin of the first component is ethylene and the alpha-olefin of the second component is ethylene. 
     
     
       4. A personal hygiene material, packaging material, or film, comprising the composition according to  claim 1 .